[R] a < b < c is alway TRUE
Peter Malewski
peter.malewski at gmx.de
Fri Jul 6 12:48:01 CEST 2001
> 3 < 2
[1] FALSE
> F < 1
[1] TRUE
> as.numeric(F)
[1] 0
p.
On Fri, Jul 06, 2001 at 12:08:51PM +0200, Monika Ferster wrote:
> Uwe Ligges writes:
> > One of our students did something like:
> >
> > x[a < b < c]
> >
> > instead of
> >
> > x[a < b & b < c]
> >
> >
> > But why is
> >
> > 3 < 2 < 1 # [1] TRUE ???
> >
>
> 3 < 2 < 1 seems to be seen like a double no because 3 < 2 < 1 < 0 returns
> F. It looks like the multiplication of -1 what is strange, because F
> corresponds to the value 0. So if you do (3<2)*(2<1) you get 0 and not the
> value of T (=1).
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